package socket;

import jdk.internal.org.objectweb.asm.util.Printer;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

/*
聊天室服务端
 */
public class Server {
    private ServerSocket serverSocket;
    private List<PrintWriter> allOut = new ArrayList<>();



    public Server(){
        try {
        System.out.println("正在启动服务端...");
        serverSocket = new ServerSocket(8089);
        System.out.println("服务端启动完毕！");
        } catch (IOException e) {
        e.printStackTrace(); }
    }
    public  void start(){
        try {
            while(true) {
                System.out.println("等待客户端连接...");
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端连接了");
                //启动一个线程处理与该客户端的交互
                ClientHandler handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Server server = new Server();
        server.start();
    }

    private class ClientHandler implements  Runnable{

        private Socket socket;
        private String host;//记录该客户端的IP地址信息
        public ClientHandler(Socket socket){
            this.socket=socket;
            host=socket.getInetAddress().getHostAddress();
        }
        public void run(){
            PrintWriter pw= null;
            try {
                InputStream is = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(is, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);


                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(out, StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                 pw = new PrintWriter(bw,true);
                synchronized (allOut) {
                    allOut.add(pw);
                }
                System.out.println(host+"上线了，当前在线人数："+ allOut.size());

                String message;
                while((message=br.readLine())!=null){
                    System.out.println(host+"客户端说："+message);
                    synchronized (allOut) {
                        for (PrintWriter o : allOut) {
                            o.println(host + "客户端说：" + message);
                        }
                    }
                }
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }finally{
                synchronized (allOut) {
                    allOut.remove(pw);
                }
                System.out.println(host+"下线了，当前在线人数："+allOut.size());
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }
    }





}
